User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Routine Maintenance Procedures
Page 5-72Install DS1 CPE Loopback Jack (T1 Only)
5
NOTE:
The loss of signal (LOS) alarm (demand test #138) is not processed
during this test while the 3-in-24 pattern is active.
5. Enter clear meas ds1 loop <location> to clear the bit error count.
6. Enter clear meas ds1 log <location> to clear the performance
measurement counts.
7. Enter clear meas ds1 esf <location> to clear the ESF error count.
8. Enter list meas ds1 sum <location> to display the bit error count. Refer
to Table 5-5
for troubleshooting information.
Table 5-5. DS1 Span Troubleshooting
Displayed
Field Function Indication
Test: cpe-
loopback-jack
Pattern 3-in-24 The loopback jack test is active.
Synchronized Y or N If “y” displays, the DS1 circuit pack has
synchronized to the looped 3-in-24 pattern and is
accumulating a count of the bit errors detected in
the pattern until the test has ended. If “n” displays,
retry the test 5 times by ending the test per Step 11
and re-starting the test per Step 4. If the circuit
pack never synchronizes, substantial bit errors in
the 3-in-24 pattern are likely. This could be
intermittent connections or a broken wire in a
receive or transmit pair in the CPE wiring.
Bit Error Count Cumulative
count of
detected errors
If there are no wiring problems, the counter
remains at 0.
A count that pegs at 65535 or continues to
increment by several hundred to several thousand
on each list meas command execution indicates
intermittent or corroded connections, severe
crosstalk, or impedance imbalances between the
two conductors of the receive pair or the transmit
pair. Wiring may need replacement.
Note that “ESF error events” counter and the ESF
performance counter summaries (“errored
seconds”, “bursty errored seconds”, and so forth)
will also increment. These counters are not used
with the loopback jack tests. However, they will
increment if errors are occurring. Counters should
be cleared following the test.